Hash Function

Hash Function

// from: https://stackoverflow.com/a/57595105

template <typename T, typename... Rest>

void hashCombine(std::size_t& seed, const T& v, const Rest&... rest) {
  seed ^= std::hash<T>{}(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
  (hashCombine(seed, rest), ...);
};